Can be A-E-F a path, if yes why? as E is end of path after A and B

 

A-E, A-E-F or B-D-F. which one are path?

 

Reference	Activity	Duration (weeks)	Predecessors
A	Hire workers	8	None
B	Install equipment	6	None
C	Order materials	3	None
D	Test equipment	4	B
E	Train workers	6	A, B
F	Pilot testing	5	C, D